Nitrogen exists primarily as _____ in the environment.

The atomic mass of an atom most closely approximates the sum of the masses of all its __________.

a. protons

b. isotopes

c. electrons

d protons and neutrons

The outermost electron shell of an atom is known as the _____________ shell.

The principal short-term energy storage molecule in cells is __________ .

Which of the following can be most accurately described as a decomposition reaction?

a. C₆H₁₂O₆ + 6 O₂ → 6 H₂O + 6 CO₂

b. glucose + ATP → glucose phosphate + ADP

c. 6 H₂O + 6 CO₂ → C₆H₁₂O₆ + 6 O₂

d. A + BC → AB + C

Organisms typically make use of phosphorus in the form of _____.

A proton ___________:

a) Has one positive charge.

b) Has one AMU.

c) Is found in the nucleus of the atom.

d) Only a and b are true.

e) a, b, and c are true.

The average oxygen atom has a mass number of 16 and an atomic number of 8. This means that the number of neutrons in this oxygen atom is:

a) 24.

b) 8.

c) 16.

d) 4.

e) 2.

How many valence electrons does an atom with five total electrons have?

a) 5.

b) 7.

c) 3.

d) 2.

e) 1.